一、申請 Facebook APP ID




二、社交外掛程式:https://developers.facebook.com/docs/plugins/like-button
<!-- Facebook 客服 -->
<style type="text/css">
.fab-fixed-wrap {
position: fixed;
z-index: 1045;
right: 30px;
bottom: 30px;
}
.fa {
display: inline-block;
font: normal normal normal 14px/1 FontAwesome;
font-size: inherit;
text-rendering: auto;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}
.fab {
font-size: 32px;
display: block;
width: 56px;
height: 56px;
border-radius: 50%;
color: #fff;
background-color: #e89a3e;
text-align: center;
box-shadow: inset 0 1px 0 rgba(255,255,255,0.15), 0 1px 1px rgba(0,0,0,0.175);
text-decoration: none;
line-height: 50px;
opacity: 0.8;
}
.fab-facebook {
background-color: #e8ac3e;
}
.fab-facebook:hover, .fab-facebook:focus, .fab-facebook:active {
outline: 0; opacity: 0.6; color: #eee;
}
</style>
<div class="fab-fixed-wrap">
<a href="https://www.messenger.com/t/tw.ugm" target="_blank" class="fab fab-facebook" title="Facebook 客服">
<span class="h2">
<span class="fa fa-comments-o"></span>
</span>
</a>
</div>